by Thomas Thomsen | May 10, 2019 | Architecture, Dimensions
Array-series have not been described in this blog until now. The concept of array-series arose as a consequence of database integration on the one side, and GAMS integration on the other side. When interfacing with a particular Danish online database...
by Thomas Thomsen | May 2, 2019 | Lags
In Gekko 2.0/2.2/2.4, and also in some other software packages, series expressions are run in an outer loop. Consider a series expression like y = x1 + x2 + x3. In AREMOS, such an expression is run n times in an outer loop, where n is the number of periods. Imagine...
by Thomas Thomsen | May 1, 2019 | Architecture, Data management, History, Syntax
The official Gekko 3.0 is now released. This is a long post, but the intent is to try to explain what Gekko 3.0 really is about. Which is actually not so easy to boil down exactly: it is perhaps best to think of it as a long-term vision, borne out of the realization...
by Thomas Thomsen | Nov 9, 2017 | Architecture, Lags, Programming
One of the main reasons for the modernization of the parser for Gekko 3.0 was that it was deemed important to handle timeseries as objects in Gekko. Timeseries are already objects in Gekko 2.0/2.2, but they are not always handled as such during calculations. To...
by Thomas Thomsen | Nov 9, 2017 | Data management, Frequencies, Programming, Syntax
To denote a timeseries with a particular frequency, AREMOS uses the dot, for instance x.a is x in its annual version, x.q is quarterly, x.m is monthly, etc. In Gekko 3.0, the dot is already quite busy, since it is used to pick out elements in collections. For...
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